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Processable Hydroxide Ink with Oriented Microstructure.

Yuanyang Xie1, Chang Yu1, Xiubo Zhang1

  • 1State Key Lab of Fine Chemicals, School of Chemical Engineering, Liaoning Key Lab for Energy Materials and Chemical Engineering, Dalian University of Technology, Dalian, 116024, China.

Advanced Materials (Deerfield Beach, Fla.)
|August 4, 2023
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Summary
This summary is machine-generated.

A new nickel/cobalt double hydroxide ink with excellent processability was developed. This innovation enables the creation of advanced materials like films and yarns for energy storage applications, overcoming previous limitations.

Keywords:
2D hydroxidesprocessable hydroxide inkscale-up fabricationzinc ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • The inherent poor processability of hydroxides due to their structural properties limits practical applications.
  • Developing processable, highly-concentrated hydroxide-based materials is crucial for technological advancement.

Purpose of the Study:

  • To engineer a processable, highly-concentrated nickel/cobalt double hydroxide ink.
  • To investigate the relationship between ink microstructure, rheology, and mechanical properties.
  • To demonstrate the ink's utility in fabricating various forms for practical applications, including energy storage.

Main Methods:

  • Synthesis of a highly-concentrated nickel/cobalt double hydroxide ink (60 mg mL⁻¹).
  • Characterization using small-angle X-ray scattering (SAXS) and cryogenic temperature scanning electron microscopy (cryo-SEM) to analyze nanoflake arrangement.
  • Processing the ink into films, yarns, and aerogels; testing film performance as electrodes in aqueous zinc-ion batteries.

Main Results:

  • The ink exhibits liquid-like rheology due to nanoflakes with a high width/thickness ratio (>100).
  • SAXS and cryo-SEM confirmed locally oriented arrangements of nanoflakes within the ink.
  • Meter-level films, continuous yarns, and free-standing aerogels were successfully fabricated.
  • Films demonstrated excellent performance as electrodes in aqueous zinc-ion batteries, achieving 382 mAh g⁻¹ at 200 mA g⁻¹ and 88% capacity retention after 400 cycles at 1000 mA g⁻¹.
  • Enlarged-batch fabrication was achieved in a 10 L reactor with efficient thermal conduction.

Conclusions:

  • The developed nickel/cobalt double hydroxide ink overcomes traditional processability limitations.
  • The study establishes a clear link between hydroxide microstructure, rheology, and mechanical engineering.
  • This work provides a pathway for developing advanced hydroxide-based products for diverse practical applications, particularly in energy storage.